wouldn't bother mate
they never answer back or say please or thanks.
attitude stinks.
March 2010
sorry but the description is a bit vague, it may be best to call out an engineer to diagnose and repair the fault unless you can give some more detail.
from what you have written it may be any number of problems.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.